Praveen Kancherla - Academia.edu (original) (raw)

Papers by Praveen Kancherla

ABSTRACT The aim of this study was to evaluate the role of alloying and rapid solidification proc... more ABSTRACT The aim of this study was to evaluate the role of alloying and rapid solidification processing in direct structural control in lead base batteries. A detailed investigation on rapid quenching of liquid lead base alloys for high performance storage battery applications was made in order to choose suitable lead grid alloys for lead acid batteries as melt-spun ribbons. S o this paper provides a comprehensive review of the physical metallurgy and mechanical properties of the melt-spun ordered alloy based on Pb, Egyptian grid battery, Germany grid battery, Pb-13.1wt.%S b, Pb-13.1wt.%S b-6.9wt.%S n, Pb-13.1wt.%S b-5.9wt.%S n-1wt.%Ca, Pb-13.1wt.%S b-4.9wt.%S n-1wt.%Ca-1wt.%Al, Pb-1wt.%Ca and Pb-0.5wt.%S n-0.1wt.%Ca for storage battery applications. The results indicate that the composition of alloys plays an important role on grid batteries performed. It is found that Pb-0.5wt.%S n-0.1wt.%Ca can be used to make the grids used for ribbon grid lead-acid batteries.

International journal of engineering research and technology, 2013

The rectangular micro strip patch antennas are attracting the attention of antenna designers from... more The rectangular micro strip patch antennas are attracting the attention of antenna designers from past few years, because of its low profile, light weight, compact. In spite of merits it also suffers with some draw backs like narrow band width, surface wave interference. Present paper we are proposing that the designer takes some precautions while designing radiating element can enhance the operating band width. Here I concentrated on width of rectangular patch, whose dimensions should maintain higher than length will enhance operating band width. Present concept was designed in Ansoft HFSS Software. Radiating element is excited by co-axial feed. Operating at 2.0369GHz. Simulated results were presented in comparatively.

EBG automation has turn into important development in the field of microwave and RF because of it... more EBG automation has turn into important development in the field of microwave and RF because of its exclusive band gap attribute at convinced frequency areas. The survey of this paper shows various EBG structure and its operations in tract with microstrip antenna and filters along with EBG structure is planned to procure solid UWB band pass filter. The counterfeit is performed by Agilent ADS software. Keywords: Electromagnetic band gap (EBG), ultra wide band (UWB), electromagnetic. Cite this Article B. Annapurna, N. Pallavi, D. Rohith, K. Praveen Kumar. Study on EBG Structures and Application in UWB Band Pass Filter, Journal of Microwave Engineering and Technology. 2015; 2(2): 5–8p.

www.ijarcet.org 1492  Abstract— In the recent years High Impedance structures are drawing lot of... more www.ijarcet.org 1492  Abstract— In the recent years High Impedance structures are drawing lot of interest in electromagnetic and antenna community. Due to compact sizes of electronic devices, required radiating element to be placed closed vicinity to electronic and biological systems hence designed antenna should have maximum radiated gain, with minimum near filed coupling with environment. This is achievable with periodic electromagnetic structures. By the Engineered electromagnetic surface textures, the properties of the metal surface are altered to perform required functions, such as change of surface impedance, to manipulate the propagation of surface waves or to control the reflection of phase. My present paper concentrating on two dimensional HIS, Multi layered mushroom type metal protrusions. They are analyzed as resonant LC circuits, These materials provide high impedance boundary conditions for both polarizations and for all propagation directions

This present paper concentrates on applications of Electromagnetic band gap (EBG) technology that... more This present paper concentrates on applications of Electromagnetic band gap (EBG) technology that is operating at microwave and sub mm wave frequencies. Some of examples of Electromagnetic band gap configurations in the region of microwave are shown, that includes array antennas, high precision GPS, mobile telephony, wearable antennas and diplexing antennas. A 500 GHz dipole configuration and a novel heterodyne mixer are shown as examples for sub millimeter wave region. Some emphasis is also placed on EBG waveguides, high impedance planes (AMCs), resonators and filters. As most fundamental components would be available in EBG technology, a fully integrated receiver could be developed in order to take full advantage of this technology. The passive and active component integration with EBG technology is now begun to materialize. Keywords: EBG, array antennas, heterodyne mixer

This paper presents an analysis and design of a polarization reconfigurable microstrip patch ante... more This paper presents an analysis and design of a polarization reconfigurable microstrip patch antenna fed with single and dual feeds operating at WLAN frequency. For a single feed structure a square patch is designed first and is perturbed for obtaining circular polarization. Using PIN diodes this design can be made to generate different polarizations. In case of a dual feed structure the radiating square patch has dual feeding provision and when these dual feeds are excited simultaneously with a phase difference of 90°, a circularly polarized wave is obtained. Depending on the relative phase difference between the feeds different polarizations are obtained. The antenna is designed for Taconic (er=2.65) substrate and the simulated results of both the antenna designs are compared and analyzed. Good circular polarization is achieved with dual feed with axial ratio bandwidth of 33.85% when compared with that of the single feed antenna design. Keywords: Patch antenna, polarization, auxil...

Beam scanning have found great demand in the field of wireless communication, satellite communica... more Beam scanning have found great demand in the field of wireless communication, satellite communication, radar, etc. [1,2]. These applications are generally covered by phased array antennas [3], where several elements are grouped together in a linear or planar special configuration. The radiated beam is determined by the vector addition of the electromagnetic fields radiated by the individual elements. Present proposal a novel technique of Tunable Multi Layer Multi Dielectric High Impedance Surface (TMMD-HIS) is embedded with array antenna, making it possible to obtain a beam scanning angle of 40 degree (from -20 degree to +20 degree) without the need of expensive active components. The major advantage of proposed concept is that the array have a negligible mutual coupling between radiating element this is happen because of suppression of surface wave. In built phase shifting is provided which reduces the structure size and proportionally cost . simulated results showing the effective...

A novel Tunable Multi Layer Multi Dielectric High Impedance Surface (TMMD-HIS) Reflector is propo... more A novel Tunable Multi Layer Multi Dielectric High Impedance Surface (TMMD-HIS) Reflector is proposed and designed in Ansoft HFSS software. The structure of TMMD-HIS consists of square metal patch arrays arranged in three dimensional, connecting vias, dielectric substrates arranged in ascending order. It exhibits two important properties first one barrier to EM waves in certain band of frequencies. Second it reflects the waves with a co-efficient of +1. Some important parameters of TMMD-HIS reflectors architecture and its effect on reflection phase characteristics, operating frequency and band width is investigated and results are presented.

The role of phase shifters in the field of beam steerable antennas is vital. The paper presents a... more The role of phase shifters in the field of beam steerable antennas is vital. The paper presents a navel technique in designing of phase shifters. This technique is facilitating many advantages along with phase shifting, such as reducing mutual coupling between array antenna elements results reduction in overall antenna size and miniaturize the radiating antenna aperture. This structure also shields the components behind the antenna. This method helps in eliminating the use of active elements in architecture and tuning of its reactance with external control circuitry. This proposal is producing an inbuilt tunable capacitive reactance, which helps to steer the beam. For analysis, numerical technique of Finite Element Method is used. The results obtained in HFSS simulation software are presented. Keywords: TMMD-HIS, phase shift, frequency, HFSS

International Journal of Recent Technology and Engineering

The current article presents the design of reconfigurable multiband antenna fed by coplanar waveg... more The current article presents the design of reconfigurable multiband antenna fed by coplanar waveguide feeding using commercially available pin diodes. Multiple input multiple output structure is proposed to reduce the polarization diversity related issues. The designed antenna operating in the wideband with coverage in 5G band. The proposed model is showing huge bandwidth of almost 10 GHz with peak realized gain of 6.8 dB. Good impedance characteristics in the operating band with Omni directional radiation makes this model suitable for future communication applications.

In this paper, we are going to present a methodology which is more suitable and easy to measure c... more In this paper, we are going to present a methodology which is more suitable and easy to measure complex permittivity of dielectric substrates using ring resonator of a planar circuits. Mainly it is based on the transmission type ring resonator with capacity coupling. On adjusting base resonant frequency of a ring resonator we can measure the dielectric constant and dissipation factor at wide frequency band and the remaining parameters can simplified or verified according to the information in this paper.

Journal of Microwave Engineering Technologies, Dec 12, 2014

Journal of Microwave Engineering Technologies, Feb 28, 2015

The effective functioning of governance is the prime concern of every citizen of the country.

International Journal of Control and Automation, 2020

Current article, presents the elliptical slot antenna design procedure for multiband applications... more Current article, presents the elliptical slot antenna design procedure for multiband applications. The suggested antenna covers L-band, WIMAX, WLAN and X band. By placing inverted T-shaped stub and three reverse U-shape stubs, the resonating characteristics of the antenna are observed. The resonating frequencies are 1.95, 4.14, 5.05, 5.89 and 9.15 GHz respectively. Proposed structure depicting better return loss (S11<-10dB) with compact size. Peak gain of 3.35 dB, antenna efficiency of 82% was achieved at all operating bands. Omni-directional radiation pattern along H-plane and bi-directional radiation pattern along E-plane are achieved.

DRS Research Journal, ISSN : 2347-7180 , 2020

Solid waste management is the thrust area. Of this various waste materials, plastic waste, tire w... more Solid waste management is the thrust area. Of this various waste materials, plastic waste, tire waste and municipal solid waste are of great concern. On the other side road traffic as well as traffic intensity is increasing. The load bearing capacity of the road should be increased. The present study is helping to take care of both these aspects. In this study developed techniques to use plastic wastes for construction purpose of roads and flexible pavement has reviewed. Utilization of waste plastic bags in bituminous mixes has proved that these enhance the properties of mix in addition to solving disposal problems. Plastic waste which is cleaned is cut into a size such that it passes through 2-3mm sieve using shredding machine. The aggregate mix is heated and the plastic is effectively coated over the aggregate. This plastic waste coated aggregate is mixed with hot bitumen and the resulted mix is used for road construction. The use of the innovative technology will not only strengthen the road construction but also increase the road life as well as will help to improve the environment. Plastic roads would be a boon for India's hot and extremely humid climate, where temperatures frequently cross 50°C and torrential rains create havoc, leaving most of the roads with big potholes. In my research work I have done a thorough study on the methodology of using plastic waste in bituminous mixes and presented the various tests performed on aggregates and bitumen.